static int uart_startup(struct tty_struct *tty)
{
	struct uart_port *uport;

	ret = uport->ops->startup(uport);
	if (ret == 0) {
		uart_change_speed();
		
	}
}

static int uart_open(struct tty_struct *tty)
{
	struct uart_driver *drv;

	drv = container_of(tty->driver, struct uart_driver, tty_driver);

	uart_startup(tty);
}

static const struct tty_operations uart_ops = {
	.open		= uart_open,
	.close		= uart_close,
	.write		= uart_write,
	.put_char	= uart_put_char,
};

int uart_register_driver(struct uart_driver *drv)
{
	
}

void uart_unregister_driver(struct uart_driver *drv)
{
}

